Genetic Variability of Agronomic Traits as Potential Indicators of Drought Tolerance in Common Beans (Phaseolus vulgaris L.)

Abstract

Sixteen progeny lines of common beans obtained from single crosses made between two parents, GLP2 and KAT B1, were grown in randomized complete block design in a rainout shelter at the Agricultural and Mechanization Research Institute, Machakos, Kenya. e experiment was conducted to study inheritance of traits associated with drought stress adaptation and to establish if significant variation for those traits was existing in order to carry out selection for drought tolerance. e calculated mean values were used to estimate heritability, genetic advance, and correlation study for each trait. Water stress had a significant (p ≤ 0.01) effect on the number of pods per plant, grains per plant, 100-seed weight, and yield per plant. e highest values for genotypic coefficient of variation (36.11%) and phenotypic coefficient of variation (36.70%) were recorded for pods plant -1 under stress condition. Highest broad-sense heritability estimates (96.54%, 94.97%, and 93.16%) coupled with high genetic advance as percent of the mean (22.32%, 34.97%, and 26.32%) were obtained for the number of pods plant − 1 , days to maturity, and yield plant − 1 , respectively, showing that selection of these traits together could lead to yield improvement under stressed conditions. Harvest index showed a significant and positive relationship with biomass aboveground (r � 0.86) and the number of pods plant − 1 (r � 0.86) indicating the possibility of identifying high performing lines of common beans for drought stress environment for further studies on these traits.

Genetic Inconsistency Assessment and Selection Criteria of Bambara groundnut (Vigna subterranea L.Verdc.) Landraces for High Yield Revealed by Qualitative and Quantitative traits

“…Direct selection can be effective considering the traits having low relative differences [72]. Considering the heritability and genetic advance index [37,38] like as more than 60% for high, 30-60% for moderate, and 0-30% for low, we found the traits BFW (Hb = 97.68% GA = 88.82%), BDW(Hb = 89.91% GA = 106.66%), FPW (Hb = 99.55% GA = 93.54%), DPW(Hb = 98.10% GA = 113.94%), DSW (Hb = 98.42% GA = 122.01%) and yield (Hb = 98.10% GA = 113.94%) were highly heritable together with high genetic advance value, recommended that for crop improvement direct selection can be effective based on these traits with effect of additive genes; similar findings documented by the previous researchers [65,73]. Low to moderate heritability and genetic advance values may hindrance in the trait's betterment due to high environmental effects over the genetic effects on its stated by Ridzuan [74].…”

Genetic Variability, Heritability, and Clustering Pattern Exploration of Bambara Groundnut (Vigna subterranea L. Verdc) Accessions for the Perfection of Yield and Yield-Related Traits

“…In past research findings on heritability, it was reported that the selection constructed for certain trait improvement does not only depend on available genetic variation but also the degrees of heritability for such variations [ 42 , 85 ]. Besides, the valuation of heritability alongside genetic advance contributes a depth advantage over the sole use of heritability [ 86 , 87 ].…”

Breeding tepary bean (Phaseolus acutifolius) for drought adaptation: A review

“…Physiological traits such as stomatal conductance are positively correlated with yield, NPPP, NSPP and total biomass production under drought stress condition in Phaseolus species such as common bean (Langat et al, 2019; Ramirez‐Vallejo & Kelly, 1998). Stomatal conductance exhibits a moderate to high correlations with yield per plant, HSW, biomass above ground, seed per pod and harvest index in common bean under drought stress condition ( r > .50) (Langat et al, 2019).…”

“…Physiological traits such as stomatal conductance are positively correlated with yield, NPPP, NSPP and total biomass production under drought stress condition in Phaseolus species such as common bean (Langat et al, 2019; Ramirez‐Vallejo & Kelly, 1998). Stomatal conductance exhibits a moderate to high correlations with yield per plant, HSW, biomass above ground, seed per pod and harvest index in common bean under drought stress condition ( r > .50) (Langat et al, 2019). Stomatal conductance shows a high (0.84) broad‐sense heritability and approximately 20% genetic advance as a percentage of the mean in common bean under drought stress condition (Langat et al, 2019), implying that selection using stomatal conductance would increase genetic gains in water‐limited environments.…”

“…Stomatal conductance exhibits a moderate to high correlations with yield per plant, HSW, biomass above ground, seed per pod and harvest index in common bean under drought stress condition ( r > .50) (Langat et al, 2019). Stomatal conductance shows a high (0.84) broad‐sense heritability and approximately 20% genetic advance as a percentage of the mean in common bean under drought stress condition (Langat et al, 2019), implying that selection using stomatal conductance would increase genetic gains in water‐limited environments. Chlorophyll content (CC) also shows moderate correlation with seed yield, plant height (PH) and number of pods per plant (NPPP) in common bean (Ambachew et al, 2015; Darkwa et al, 2016).…”